基于GMM的说话人识别系统

实现了一个基于高斯混合模型（GMM）的说话人辨识系统。GMM是用多个高斯分布的概率密度函数的组合来描述特征矢量在概率空间的分布状况，不同的说话人对应了不同的GMM。模型的训练采取了极大似然估计（ML）的EM方法。并在不同的数据集上实验，得到了好的结果。     

基于嵌入式控制模块的制造厂监测系统设计

I-7188E系列嵌入式网络控制器是为了适应以太网/因特网的普遍应用要求而设计的,在工业环境中它能够替代PC或PLC工作。设计了由总厂上位监测计算机、I-7188E2D嵌入式网络控制器与现场RS-485子网组成的自动门制造厂网络监测系统。并对I-7188E2D的特点、应用程序开发及网络连接方法作了详尽的介绍。系统满足了多测点、高传输速度、大数据量的传送要求。从而为在传统的网络监测系统中运用嵌入式技术开辟了一条途径。     

APA/APAGS Award for Distinguished Graduate Student in Professional Psychology.

The APA/APAGS Award for Distinguished Graduate Student in Professional Psychology is awarded on an annual basis by the Board of Professional Affairs (BPA) and the American Psychological Association of Graduate Students (APAGS) to a graduate student who has demonstrated outstanding practice and application of psychology. Award winners from 2002-2005 are listed. This document includes the citation awarded to Renée E. DeRouin, winner of the 2005 APA Award for Distinguished Scientific Applications of Psychology. A brief biography and a selected bibliography of the DeRouin accompany the citation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A capacitance based axial position sensor for cryocoolers

The recent development of a Stirling cryocooler designed to operate with a body temperature of less than 220 K required an axial motor position sensor which could operate over this temperature range. Although linear variable differential transformers (LVDTs), have traditionally been used, these are temperature dependent and would have required development due to integrated electronics, which could not be used at these low temperatures. A sensor was therefore developed based on the principle of measuring the capacitance between static and moving concentric rings. The design is presented along with the signal conditioning circuit. Experimental results show that the sensor had suitable bandwidth with a temperature independent gain between room temperature and 220 K. Future developments are described including a similar sensor to measure the radial motion of a motor during operation.     

A single-stage pulse tube cooler reached 12.6 K

A single-stage G-M type pulse tube cooler (PTC) was designed and tested to explore the lowest attainable refrigeration temperature and to further improve the cooling performance in the temperature range of 15-40 K. The magnetic material Er₃Ni was used as part of the regenerative material besides the phosphor-bronze and the lead so as to improve the efficiency of the regenerator. With an input power of 6 kW, a lowest no-load refrigeration temperature of 12.6 K was obtained, which is a new record for the single-stage PTC. The cooling capacity at 15-40 K was also significantly improved, which may extend the application of the single-stage PTC for the cooling of superconductors and cryopumps.     

证券广播、信息处理系统的设计与实现

本文提出一种证券广播、信息处理系统，能实时的完成电脑证券系统的所有功能又无需上网。使用不同的接口．可应用于电脑系统和电视系统。本文主要从两个方面论述了该系统的原理，以W77E58为主芯片的证券信息广播服务器系统和以DALLS80C320为主要芯片的证券信息处理（接收、分析、交易）系统，并在此基础上，详细介绍了实现证券信息广播和接收、分析、交易的方法和原理。     

Characterization of zirconia-thoria-urania ceramics by X-ray and electron interactions

X-ray and electron interactions with matter were used as probes to characterize the structure and chemistry of zirconia-thoria-urania ceramics. The ceramics were prepared by coprecipitation of Zr, Th and U salts. In this study, transmission electron microscopy (TEM) techniques such as energy dispersive X-ray (EDX) analysis and electron energy loss spectroscopy (EELS) complement X-ray diffraction, extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge spectroscopy (XANES), techniques to reveal the phase structure and chemistry. The results from XRD and EDX show that these ceramics separate into a Zr-based phase and an actinide-based phase with low mutual affinity of Th and Zr, as well as partial solubility of U in Zr. The comparison of EELS spectra collected for the ceramics with spectra collected for UO₂ and U₃O₈ reference materials also allow us to assess U oxidation state independently in the two separate phases.     

用NaI(Tl)探测器测量γ辐射场剂量特性的加权积分法研究

辐射场剂量特性的测量可以通过剂量率仪或谱 剂量转换的方法来实现。其中一种谱 剂量转换的方法是通过一个G(E)函数 ,把测得的结果直接换算成剂量而不需解谱。本文采用这种方法 ,对一个75mm× 75mm的NaI(Tl)探测器的能谱特性进行测量与分析 ,算出了该晶体的G(E)函数值及估计的误差 ,并用此方法与高气压电离室作了比对测量     

中间件技术在程序设计中的运用

分析了中间件产生的原因、它的定义、中间件技术在三层结构中的作用、所能解决的问题,并介绍了中间件技术在Web数据库、TCP/IP网络接口和电子商务等程序设计中的重要性及其应用。     

计算机高速数字电路设计技术

介绍了电源分布系统和传输线阻抗对高速电路设计的影响,并根据实践经验对如何处理高速电路电源系统的问题和注意事项提出一些指导意见,该文将对越来越多的设计者涉足高速电路的设计提供很好的帮助。